The Niall Horan, Liam Payne, Zayn Malik, Harry Styles and Louis Tomlinson confirmed the news while they were on NBC's Today Show.
Super Size Me's Morgan Spurlock will direct the movie through TriStar Pictures.
Morgan said, "This is an incredible opportunity and an amazing moment in time for the band.
"To capture this journey and share it with audiences around the world will be an epic undertaking that I am proud to be a part of."
Simon Cowell is already making a fortune of the band so it's no surprise he's happy with the news.
He said, "I'm delighted we're making this film and Morgan is the perfect person to give that access-all-areas, behind-the-scenes look into what it's like to be One Direction today.
"What the band have achieved is incredible, they and their fans have made history around the world - this is for them."
The flick will hit cinemas on 30 August 2013.
As if that wasn't enough the boys also got a visit from Johnny Depp when they were recording a track in LA.
A source said, "Johnny found out 1D were in town and, after making a few calls, they came round to his studio.
"[Johnny] brought out his piano and guitars for the boys to test and they had a little jam session.
"Lily Rose just watched with her blushing mates while her dad temporarily joined the world's biggest boyband."
Johnny Depp is just the coolest guy ever!
Are you excited to see One Direction on the big screen?
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